Adhesive compound



UNITED STATES PATENT @rricE.

CLAYTON BEADLE, OF LONDON, ENGLAND, ASSIGNOR TO THE AlliERICAN VISCOSE COMPANY, OF BOSTON, MASSACHUSET"$.

ADHESIVE COMPOUND.

SPECIFICATION forming part of Letters Patent No. 569,704, dated October 20, 1896.

Application filed June 8, 1894. Serial No. 518,905. (No specimens.)

To all whom it may concern: per cent. of sulfate of alumina, just sufti- 50 Be it known that I, CLAYTON BEADLE, o cient to precipitate the resin as resinate of London, county of Middlesex, England, have alumina. This is passed through a cloth or invented an Improvement in Adhesive Comfiltering medium, whereby the resinate of 5 pounds, of which the following description is alumina is retained and the soluble by-prod-' a specification. ucts pass through. The mixtu re, after drain- This invention has forits object to produce ing, contains from twenty to twenty-five per a new and useful adhesive compound adapted cent. of fiocculent resinate of alumina, and for bookbinding, cabinet-making, and many this is mixed with the solution of the cellu- IO other purposes. lose compound in the proportions above The adhesive compound consists, cssenstated. 60 tially, of a plastic compound of cellulose, with The adhesive compound thus produced is the addition thereto of certain substances applied or used in substantially the same which augment and improve its adhesive manner as glue.

:5 properties-such, for instance, as an insolu- The solution should always be used cold,

ble soap, which may he made in various ways but after the application to any surface the 6 and of different ingredients, such, for insame may be heated or placed in a warm stance, as rcsinate of alumina or resinate of place to accelerate the drying and decompozincthe compound thus produced being alsition.

2o lowed to slowly decompose after application, The resinate of alumina combines with the resulting in the formation of insoluble amorfree alkali contained in the original solution phous or non-fibrous cellulose, with certain to form resinate of soda and aluminate of lay-products, which are or may be retained, as soda, which results in the prod notion of avery their presence is by no means objectionable viscous and tacky solution. This when ap- 2 5 for many purposes. plied to any surface remains tacky for a suf- The decomposed adhesive compound orinficient length of time to enable the operator 7 5 soluble amorphous cellulose is not acted upon to coat several pieces and to apply them one by moisture or by contact with water, as is by one to any surface or to remove apiece the ordinary glue, and, furthermore, it has after it has been appliedto alter its position 0 great flexibility. on the surface without interfering with its In making the adhesive compound I prefer power of sticking. This property is of great So to use a mixture which is prepared as follows: value in bookbinding and other Work.

Take a solution made by dissolving one part Ifit is desired to give a thick coating, three of the plastic compound of cellulose, made, or four applications may be made, leaving a for example, by treating cellulose with a few minutes in between each to allow the socaustic alkali and carbon bisulphid, as set lution to become absorbed. 85

forth in Letters Patent No. 520,770, in four The addition of the insoluble soap, as the parts of water, and add to the same, say, two resinate, for instance, also has the effect of parts of an insoluble soap, preferably consistgiving the adhesive compound additional 40 ing, essentially, of resinate of alumina. This flexibility.

insoluble soap maybe made in the following As the adhesive compound decomposes its 90 way, viz: Resin, preferablypulverized,is discharacter is changed, as, for instance, the solved by boiling it with a strong alkali, such soluble cellulose compound becomes an inas asolution of carbonate of soda. The same soluble compound of an amorphous nature.

45 is filtered, and after cooling the mass, which lVhen it is necessary to have a perfectlyconsists of a resin soap, it is dissolved in wacolorless solution, suchv when two pieces of 9 ter, which may be done at 90 Fahrenheit or white paper are to be adhered together or thereahout, to form a milkysolution. To this 'When the end sheets of the book are to be adis added a solution containing, say, twenty hered to the side boards, I use a decolorized .of sodium bisulfite or its equivalent.

solution, which may be made by dissolving one part of the aforesaid plastic compound of cellulose in five parts of water and adding thereto one part of a five-per-cent. solution of sulfurous acid or its equivalent.

This solution for some purposes may be diluted with twice its volume of water, but for other purposes where high sticking qualities are required it should be used at its full strength.

In place of sulfurous acid sodium bisulfite or certain weak or organic acids, such as acetic acid, maybe used. For some purposes a mixture of this decolorized solution with the mixture first referred to may be used with advantage.

In order to obtain a stronger decolorized so lution, I may take the plastic compound of cellulose prepared as set forth in the application rel'erred to, in a flaky condition, as when first made, and mix it with a solution I dissolve one part of the sodium bi sulfite in twenty parts of water and mix two parts of the plastic-cellulose compound with five parts of the bisulfite solution. This on agitation for thirty minutes or thereabout dissolves, producing a strong decolorized solution which keeps longer than the decolorized solution made by the first-described method.

For other adhesive purposes where apurer solution is required, such as for sticking together sheets of pastings for the production of a fine quality cardboard and the like, I proceed as follows: To ten parts of the freshlymade flaky plastic cellulose compound is added, say, eight parts of a solution containing thirty per cent. of sodium bisulfite, by which the plastic mass is decolorized without entering into the solution. The mass is submitted to pressure, by which the greater part of the byproducts are removed. The resulting flaky material is dissolved by agitation with Water. If a smaller amount of bisulfite is added, it will be found more dillicult to remove the by-products by pressure, but the compound after pressing will be more regularly dissolved and the solution obtained therefrom less liable to chemical change.

The mixtures made by one or other of the above methods should be kept cool, as they last longer and retain their tacky qualities at a low temperature.

Substances may be added to these solutions to render them more pliant, such as glycerin, deXtrin, or glucose. lVhen any one of these mixtures is used for adhesive purposes, it is caused to adhere by the solution setting or gelatinizin g, after which the same decomposes with the formation of insoluble amorphous cellulose. The by-products obtained by this decomposition are retained in the medium chiefly as sulfate of soda.

In the mixtures where resinate of alumina is used the resin combines with the free soda and likewise with the alumina to form so dium resinate and aluminate, both of which are retained by the insoluble amorphous cellulose, the former adding to its pliability and flexibility and the latter giving it body.

The presence of sulfate of soda is by no means an objection for many purposes.

WVhen the insoluble soap is omitted, the soluble cellulose compound will be used, with the result that decomposition takes place after application, and an insoluble amorphous or non-fibrous cellulose is produced.

I claim- 1. The adhesive compound herein described consisting essentially of a mixture of a soluble compound of cellulose, and an insoluble soap.

2. The adhesive compound herein described consisting essentially of a mixture of a soluble compound of cellulose, consisting of cellulose treated with a caustic alkali and carbon bisulfid, and an insoluble soap.

3. The adhesive compound herein described consisting essentially of a mixture of a soluble compound of cellulose and resinate of alumina, or its equivalent.

4. The decolorized adhesive compound herein described consisting essentially of a mixture of a soluble compound of cellulose, and a decolorizing agent, and an insoluble soap.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CLAYTON BEADLE. lVitnesses:

B. J. NOYES, FLORENCE I-I. DAVIS. 

